As an institution, is the UN completely outmoded?
A number of high profile failures to "step in" to a conflict have lead to disaster (Rwanda's a good example). Most of the heavy lifting of the UN seems to be done by a few countries (NATO, larger members of the African Union, etc.) Further, the whole structure of the UN lends credence to the notion that all nations are created equal. Nuclear powers have the same voting rights as tiny island states. Voting rights do not factor in population levels, and assignment of nations to committees is a joke: Libya served on the human rights committee!
Further, resolutions are toothless. The UNSC can make as many resolutions as it wants about Israel, but whilst America backs them, there's nothing that can be done.
In short, what is the point of the UN? It fails at what it was set out to stop (genocide) and is inherently unfair in how it operates.